Hugh mcdonald



(No Model.)

H. MQD'ONALD.

, I CAST-ER.

No. 282,099 Patented July 31. 1883.

N. FEYERs. Plwloljlhcgnphnn Wnh'mglon. Dv C.

UNITED STATES PATENT @Frica HUGH MQDONALD, or rLATTsBURc, new YORK, ASSIGNOR or ONE-HALF o DUGALD GRAHAM, or MONTREAL, cANADA.

CASTER.

SPECIFICATION forming-part of Letters Patent No. 282,099, dated July 31, 1883,

Application filed November 4,1882. (No model.) I

To aZZ whom it may concern.-

Be it known that I, HUGH MCDONALD, of

V the village of Plattsburg, in the county of Clinton and State of New York, have invented a certain new and useful Improvement in Gaster Attachments; and I do hereby declare that the following is afull, clear, and exact description of the same.

This invention relates to a caster attachment for the legs of sewing-machines, tables,

&c., and has for its object to permit the same to be adjusted in order to provide for any unevenness of the floor, and thus steady and render rigid the article to which it is attached. It may be briefly described as consisting in the combination, with the leg of a sewingmachine or other stand or table, of a caster or roller which can be adjusted to the floor automatically or otherwise; but to thoroughly 2o comprehend my invention reference must be had to the accompanying drawings, in which letters similar to those used in the following description indicate like parts, and where- I Figure l is a view of part of a sewing-ma- 2 chine or other like stand embodying my invention. Fig. 2 is an enlarged sectional elevation of my caster attachment and means for adjusting same. Fig. 3 is a sectional elevation illustrating a modification of my inven- 0 tion; and Fig. 4 is another view, partly in sec tion, of said modification.

Letter A represents the stand of any sewing-machine, table, or other article of furniture or machine requiring casters, B B being 3 5 the extensions or legs to which the casters 0 O are attached. Those marked 0 are of any ordinary or suitable construction; but to one leg is attached the caster G, constructed and arranged as shown in Fig. 2-viz., with a slot, 0, in each arm of a fork formed at the lower end of the extension B, in which the pivot-pin c of the caster-stock 0 can work up and down. This caster-stock 0 has also a vertical spindle, c, which fits into a suitable 5 hole or recess, 1), in the leg B, said recess containing also a coiled spring, D, which bears upon the upper end of the caster-spindle c,

the latter being also acted upon. by a thumb screw, E, working in a hole in the leg B into a suitable groove, 0*", in the spindle c.

The operation of the above device will be easily understood; but I may explain that by loosening the thumb-screw E the spring I) forcesthe spindle c, and consequently the easter-stock c and caster, downward (the pivotpin 0 working in the slot 0 of the leg B) until the table or stand is level, when the thumbscrew E is again tightened and the caster thus secured rigidly in place.

It is well known that three legs of a fourlegged stand can always find their level together on an uneven floor, and therefore it is only necessary to use my adjustable caster on one leg to effect my object.

In Figs. 3 and i I have shown a modified arrangement of my invention, part of the leg B being pivoted at a to the frame A, and the caster or roller C being attached thereto rigidly, the spring D in this case being arranged inside the forked lower end, a, of one of the legs of the main frame to bear 011 a leveled upper side of the leg B, which is also contained within the fork, and a screw, E, fixed rigidly in the leg B, and working up and down in aslot, (E, in the fork a, as shown in Fig. 4, the same being tightened by a thumbnut, c, impinging against the side of the fork.

Many other modifications of my invention might be devised to effect precisely the same purpose and result, such as carrying the spin- So dle 0* straight up through the turned-out portion of the leg B, (which of course would be shaped accordingly,) and have its upper end screwed and provided with a thumb-nut, on loosening which the spring inside would force 8 5 down the caster, as will be readily understood; or the spring may be done away with and the caster worked up and down by means of a screw alone, &c., all of which devices would be tributary to my invention.

What I claim, and desire to secure by Letters Patent, is as follows:

1. The combination, with a stand or table the lower end of one of the legs of which is pro vided with a socket and a fork extending be- 95 low the socket, of a caster the stock of which is seated in said fork, a spring compressed oted leg'B, having fixed caster C, screw E,

within the socket by the upper end of the and thumb-nut a, substantially as and for thecaster-spindle, and a set-screw to rigidly sepurpose described.

cure the caster after vertical adjustment, sub- HUGH MCDONALD.

stantially as described. Vitnesses:

2. The combination, with the frame A, hzw- V GEO. L. CLARK,

ing slotted fork a, and spring I), of the piv- B. RAMSAY. 

